ISO INTERNATIONAL STANDARD 5149-4 Second edition 2022-11 Refrigerating systems and heat pumps - Safety and environmental requirements Part 4: Operation, maintenance, repair and recovery Systemes frigorifiques et pompesa chaleur-Exigencesde securite et d'environnement Partie 4:Fonctionnement, maintenance,réparation etrécuperation Referencenumber ISO 5149-4:2022(E) ISO2022 IS0 5149-4:2022(E) COPYRIGHTPROTECTEDDOCUMENT IS02022 All rights reserved. Unless otherwise specified, or required in the context of its implementation, no part of this publication may be reproduced or utilized otherwise in any form or by any means, electronic or mechanical, including photocopying,or posting on the internet or an intranet, without prior written permission. Permission can be requested from either Iso at the address below or ISO's member body in the country of the requester. Iso copyright office CP401:Ch.de Blandonnet8 CH-1214 Vernier, Geneva Phone:+4122 749 0111 Email: [email protected] Website:www.iso.org Published inSwitzerland ii @IS02022-All rights reserved